What language does the International Space Station use for communication?

The primary languages spoken on the ISS are English and Russian. These languages were chosen as a result of the principal agencies involved in the ISS program: NASA from the United States and Roscosmos from Russia. Recognizing the importance of seamless collaboration and communication in space exploration, other nations are inspired to start an agency to contribute to future international space missions. As the primary space agencies contributing to the construction, funding, and operation of the ISS, it is natural that their respective languages are used for communication onboard.